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Old Posted Dec 25, 2007, 1:14 AM
zeno333 zeno333 is offline
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Pittsburgh's US Steel Tower outside columns...

I recently saw online a picture of some of the individual pices that make up the outside supporting columns of the US Steel Tower in Pittsburgh. they are in a steel mill yard somewhere, with a picture of a steel working next to them.
Most descriptions of the US Steel Tower say that the outside columns are "hollow" and have the aniti-freze like fluid in them, but in fact from the picture I saw, the columns in fact are not hollow per say, but in fact are solid steel, with 2 open "slits" in them, and thay are around a half inch to three-quarters of an inch thick, in that ballpark. So the columns have much more steel in them than i thought before. (One can see the inside structure of the columns since one can see the sides of the columns when they are lying down.)
I saved the picture to my hard drive, but I can not post it in the found pic section since i do not know who took the pic, and it would not be posted as a result. If anyopne though is dying to see the pic, maybe you can email me a request, and i can send it to you. My email is the same name as my handle here at that "y a h o o" web site thingy. I had to find someway to get it out there, since its such an interesting picture for anyopne to see that has an interest in the US Steel Tower in Pittsburgh.
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Old Posted Dec 27, 2007, 1:11 AM
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Kelvin Kelvin is offline
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Tube columns are not "solid" but may appear to be because there are often intermediate plates that help prevent thin (vertical) plate elements from buckling.

A solid column of this size would be hard to fabricate (in fact I can't think of any producer that would be capable of building such a piece of steel), difficult to handle, expensive to build, and be fantastically over-capacity. Most steel sections are limited to about 3" thickness - after which the material becomes too thick to cool evenly and large deformations and internal stresses can occur.
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